WHEN I log in from a different application or an different other mailbox gives an password error???

LaraH

New Email
I have a very different and big problem and PLEASE READ ME CAREFULLY OK?
There is no error in my password I can login and I can send and receive mail BUT WHEN I log in from a different application or an different other mailbox gives an password error (AUTHENTICATIONFAILED-LOGIN Invalid credentials).
I changed my password and tried again but gives the same error again, so I changed the password for nothing.
I have 2 different e-mail addresses but in these e-mail addresses don't make any mistakes.
The error only arrives at just one mail address, WHY?
So what should I do now, please find me a solution OK? I will wait for your reply immediately. Thank you.
 
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